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Animal rights, properly understood, is an ideology that insists the capacity to feel pain is the basis for possessing rights. Hence, several years ago, PETA claimed that eating meat is an evil equivalent to Auschwitz.
Now, with some studies showing that fish may feel pain, we are told over at the Huffington Post to stop eating fish. The writer is Marc Bekoff, a professor (of course) of Ecology and Evolutionary Biology. From "Science Shows Fish Feel Pain, So Let's Get Over It and Do Something to Help These Sentient Beings":